FREEWARE SUDOKU PC v1.7 (Windows)

The number puzzle Sudoku, is a grid of 9×9 cells made up of 9 regions of 3×3 cells.
The aim of the puzzle is to enter a numeral from 1 through 9 in each cell of a grid.

The simple rule: Each row, column and region comprises only one instance of the numbers 1 through 9.
Note: Completing the puzzle requires patience and logical ability. The solution is unique for each sudoku.